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22 July, 14:25

Alyssa flips a fair, two-sided coin four times. What is the probability that the coin lands with heads facing up exactly three times?

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  1. 22 July, 14:34
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    Fair coin means P (heads) = 1/2 for each flip.

    The three flips are independent, so multiplication rule applies.

    P (head, head, head) = (1/2) (1/2) (1/2) = 1/8
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